All things must be examined, debated, investigated without exception and without regard for anyone's feelings... We must run roughshod over all these ancient puerilities, overturn the barriers that reason never erected, give back to the arts and sciences the liberty that is so precious to them.

Those who fear the facts will forever try to discredit the fact-finders.

It has been said that love robs those who have it of their wit, and gives it to those who have none.

Instinct guides the animal better than the man. In the animal it is pure, in man it is led astray by his reason and intelligence.

There is only one virtue, justice; only one duty, to be happy; only one corollary, not to overvalue life and not to fear death.

My ideas are my whores.

What has not been examined impartially has not been well examined. Skepticism is therefore the first step towards truth.